Identifying and authentication of a user is very common and useful part of every web appilication, In CakePHP AuthComponent provides a way to secure user's password in encrypt manner and allow user to authenticate objects as well. It is a process of verifying a user by verifying its username and password. AuthComponent uses Hashing Password for hiding the real password to the database it can be done through blowfish, it has been added to the controller.

AppModel:

<?php 
	App::uses('AppModel', 'Model');
	App::uses('BlowfishPasswordHasher', 'Controller/Component/Auth');
?>

AppController:

<?php
App::uses('Controller', 'Controller');

class AppController extends Controller {
	public $components  = array('Session','Auth' => array(
            'loginRedirect' => array(
                'controller' => 'projects',
                'action' => 'index'
            ),
            'logoutRedirect' => array(
                'controller' => 'projects',
                'action' => 'index'
            ),
            'authenticate' => array(
                'Form' => array(
                    'passwordHasher' => 'Blowfish',
                    'fields' => array('username' => 'email')
                )
            ),
        ));
	 public function beforeFilter() {
        parent::beforeFilter();
        $this->Auth->allow('registration','logout','getCities','getStates');	// Allow users to register and logout.

    }

}

Modelcontroller:

<?php
App::uses('Controller', 'Controller');
App::uses('AuthComponent','Controller/Component');
?>